High-purity, high-crystallinity spherical nickel-cobalt-manganese precursor material and preparation method thereof

Abstract

The invention discloses a spheroidic nickel-cobalt-manganese precursor material with high purity and high crystallinity. The chemical molecular formula of the precursor material is Ni1-x-yCoxMny(OH)2, wherein x is more than 0 and less than 1, and y is more than 0 and less than 1; and the mass fraction of sodium impurities in the precursor material is not more than 0.012%, the mass fraction of sulfate radical impurities is not less than 0.30%, the precursor material has high crystallinity, and the characteristic peak 001 intensity of an XRD atlas is not less than 1100. The invention also discloses a preparation method of the nickel-cobalt-manganese precursor material. The method comprises the steps of raw material preparation, coprecipitation and ageing treatment, and at least one of the above three steps adopts an anti-oxidation measure. The above product has the advantages of low content of impurities, good crystallinity, simple process flow, realization of continuous production, and stable and excellent quality.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode materials, and in particular relates to a nickel-cobalt-manganese precursor material for lithium battery cathode materials and a preparation method thereof. Background technique [0002] As a new type of green secondary battery, lithium-ion batteries have the advantages of large specific capacity, long cycle life, small self-discharge, light weight, and no memory effect. At present, it has been widely used in various mobile electronic products (such as mobile phones, cameras, notebook computers, etc.), artificial satellites, aerospace and other fields, and has a good application prospect in the fields of electric vehicles and electric motorcycles. In order to meet the growing needs of these application fields, the demand for lithium-ion secondary batteries with larger capacity, lighter weight and smaller size is increasing. Therefore, the specific capacity performance of lithium-io...

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Problems solved by technology

However, in the reaction process of the co-precipitation method, due to the existence of a small amount of oxygen in the solution, the violent stirring in the precipitation process and the tightness of the reactor, etc., the cobalt-manganese exists more or less in the precipitation process. Oxidation, which in turn leads to poor nickel-cobalt-manganese co-precipitation effect, and a brownish-brown precipitate is obtained, and the product has high impurity content and poor crystallinity, which makes the product consistency not high, which further affects the performance of subsequent processing battery materials

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